Nucleon Effective Mass in Asymmetric Nuclear Matter within Extended Brueckner Approach
GAN Sheng-Xin1,2,ZUO Wei1**,U. Lombardo3
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 2Graduate School of Chinese Academy of Sciences, Beijing 100049 3Department of Physics and Astrophysics, Catania University, Via Santa Sofia 64, I-95123, Italy
Nucleon Effective Mass in Asymmetric Nuclear Matter within Extended Brueckner Approach
GAN Sheng-Xin1,2,ZUO Wei1**,U. Lombardo3
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 2Graduate School of Chinese Academy of Sciences, Beijing 100049 3Department of Physics and Astrophysics, Catania University, Via Santa Sofia 64, I-95123, Italy
摘要The on-shell properties of the nucleon effective mass in asymmetric nuclear matter are investigated in the framework of an extended Brueckner–Hartree–Fock (BHF) approach. The proton and neutron effective masses in neutron-rich nuclear matter are predicted by including both the effect of ground state correlations and the three-body force (TBF) rearrangement contribution. Within this framework, the neutron effective mass is predicted to be larger than the proton one in neutron-rich nuclear matter, i.e., mn* ≥mp*. The effect of ground state correlations turns out to be dominated at low densities and it leads to a strong enhancement of the effective mass. The TBF rearrangement contribution becomes predominant over the effect of ground state correlations at high densities and it reduces remarkably the absolute magnitude of the isospin splitting of the neutron and proton effective masses in neutron-rich matter at high densities.
Abstract：The on-shell properties of the nucleon effective mass in asymmetric nuclear matter are investigated in the framework of an extended Brueckner–Hartree–Fock (BHF) approach. The proton and neutron effective masses in neutron-rich nuclear matter are predicted by including both the effect of ground state correlations and the three-body force (TBF) rearrangement contribution. Within this framework, the neutron effective mass is predicted to be larger than the proton one in neutron-rich nuclear matter, i.e., mn* ≥mp*. The effect of ground state correlations turns out to be dominated at low densities and it leads to a strong enhancement of the effective mass. The TBF rearrangement contribution becomes predominant over the effect of ground state correlations at high densities and it reduces remarkably the absolute magnitude of the isospin splitting of the neutron and proton effective masses in neutron-rich matter at high densities.
GAN Sheng-Xin,ZUO Wei**,U. Lombardo. Nucleon Effective Mass in Asymmetric Nuclear Matter within Extended Brueckner Approach[J]. 中国物理快报, 2012, 29(4): 42102-042102.
GAN Sheng-Xin,ZUO Wei**,U. Lombardo. Nucleon Effective Mass in Asymmetric Nuclear Matter within Extended Brueckner Approach. Chin. Phys. Lett., 2012, 29(4): 42102-042102.
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2012, Vol. 29 
